import { describe, it } from "mocha";
import { RPCServer, RPCSocket } from '../Index'
import { RPCExporter } from "../src/Interfaces";
import { ConnectedSocket } from "../src/Types";
import * as log from 'why-is-node-running';
import * as http from 'http';
import * as express from 'express';
import * as fetch from 'node-fetch';

const add = (...args: number[]) => { return args.reduce((a, b) => a + b, 0) }
function makeServer() {
    let subcallback
    const sv = new RPCServer([{
        name: 'test',
        RPCs: [
            {
                name: 'echo',
                call: async (s: string) => s,
            }, {
                name: 'simpleSubscribe',
                hook: async (callback) => {
                    subcallback = callback
                    return { topic: "test" }
                },
                onClose: (res) => { }
            }, {
                name: 'subscribe',
                hook: async (callback) => {
                    subcallback = callback
                    return { topic: "test" }
                },
                onClose: (res, rpc) => {
                    console.log("onClose", rpc.name === 'subscribe' && res ? "OK" : "")
                    subcallback = null
                },
                onCallback: (...args: any) => {
                    console.log("onCallback", args[0] === "test" && args[1] === "callback" ? "OK" : "")
                }
            },
            add,
            function triggerCallback(...messages: any[]): number { return subcallback.apply({}, messages) },
        ]
    }], 
    {
        connectionHandler: (socket) => {
        },
        closeHandler: (socket) => { },
        errorHandler: (socket, err) => { throw err }
    })
    sv.listen(21010)
    return sv
}


describe('RPCServer', () => {
    let client, server
    const echo = (x) => x

    before(done => {
        server = new RPCServer([{
            name: 'HelloWorldRPCGroup',
            RPCs: () => [
                echo, //named function variable
                function echof(x) { return x }, //named function
                {
                    name: 'echoExplicit', //describing object
                    call: async (x, y, z) => [x, y, z]
                }
            ]
        }])
        server.listen(21003)
        client = new RPCSocket(21003, 'localhost')
        done()
    })

    after(done => {
        client.close()
        server.close()

        done()
    })

    it('should be able to use all kinds of RPC definitions', (done) => {
        client.connect().then(async () => {
            const r0 = await client['HelloWorldRPCGroup'].echo('Hello')
            const r1 = await client['HelloWorldRPCGroup'].echof('World')
            const r2 = await client['HelloWorldRPCGroup'].echoExplicit('R', 'P', 'C!')


            if (r0 === 'Hello' && r1 === 'World' && r2.join('') === 'RPC!') {
                done()
            } else {
                done(new Error("Bad response"))
            }
        })
    })

    it('new RPCServer() should fail on bad RPC', (done) => {
        try {
            const sv = new RPCServer([{
                name: 'bad',
                RPCs: () => [
                    (aaa, bbb, ccc) => { return aaa + bbb + ccc }
                ]
            }])
            sv.listen(20001)
            done(new Error("Didn't fail with bad RPC"))
        } catch (badRPCError) {
            done()
        }
    })
})

describe('RPCServer with premade http server', () => {
    const echo = (x) => x
    const RPCs = [
        echo, //named function variable
        function echof(x) { return x }, //named function
        {
            name: 'echoExplicit', //describing object
            call: async (x, y, z) => [x, y, z]
        }
    ]

    const RPCExporters = [
        {
            name: 'HelloWorldRPCGroup',
            RPCs: RPCs,
        }
    ]

    const RPCExporters2 = [
        {
            name: 'Grp2',
            RPCs: [
                function test(){ return "test" }
            ],
        }
    ]

    let client:RPCSocket, server:RPCServer

    before(done => {
        const expressServer = express()
        const httpServer = new http.Server(expressServer)

        expressServer.get('/REST_ping', (req, res)=>{
            return res
            .send('REST_pong')
            .status(200)
        })

        server = new RPCServer(
            RPCExporters,
        )
        server.attach(httpServer)
        httpServer.listen(8080)

        client = new RPCSocket(8080, 'localhost')
        
        done()
    })

    after(done => {
        client.close()
        server.close()

        done()
    })

    it('should serve REST', (done) => {
        fetch('http://localhost:8080/REST_ping').then(response => {
            response.text().then(text => {
                if(text === "REST_pong")
                    done()
                else
                    done(new Error("REST repsonse was "+text))
            })
        })
    })


    it('should be able to use all kinds of RPC definitions', (done) => {
        client.connect().then(async () => {
            const r0 = await client['HelloWorldRPCGroup'].echo('Hello')
            const r1 = await client['HelloWorldRPCGroup'].echof('World')
            const r2 = await client['HelloWorldRPCGroup'].echoExplicit('R', 'P', 'C!')


            if (r0 === 'Hello' && r1 === 'World' && r2.join('') === 'RPC!') {
                done()
            } else {
                done(new Error("Bad response"))
            }
        })
    })
})


describe('RPCSocket', () => {
    let client: RPCSocket
    let server: RPCServer

    before(async () => {
        server = makeServer()

        client = new RPCSocket(21010, "localhost")
        return await client.connect()
    })

    after(() => {
        client.close()
        server.close()
    })


    it('should have rpc echo', (done) => {
        client['test'].echo("x").then(x => {
            if (x === 'x')
                done()
            else
                done(new Error('echo RPC response did not match'))
        })
    })

    it('should add up to 6', (done) => {
        client['test'].add(1, 2, 3).then(x => {
            if (x === 6)
                done()
            else
                done(new Error('add RPC response did not match'))
        })
    })

    it('should subscribe with success', (done) => {
        client['test'].simpleSubscribe(console.log).then(res => {
            if (res.topic === 'test') {
                done()
            } else {
                console.error(res)
                done(new Error('Subscribe did not return success'))
            }
        })
    })

    it('subscribe should call back', (done) => {
        client['test'].subscribe((...args: any) => {
            if (args[0] === "test" && args[1] === "callback")
                done()
            else
                done(new Error("Bad callback value " + args))
        }).then(async () => {
            await client['test'].triggerCallback("test", "callback")
        })
    })

    it('simpleSubscribe should call back', (done) => {
        client['test'].simpleSubscribe((...args: any) => {
            if (args[0] === "test_" && args[1] === "callback_")
                done()
            else
                done(new Error("Bad callback value " + args))
        }).then(async () => {
            await client['test'].triggerCallback("test_", "callback_")
        })
    })
})

describe('It should do unhook', () => {
    const yesCandy = "OK"
    const noCandy = "stolen"
    let candy = yesCandy
    let cb: Function
    let cb2: Function
    let client: RPCSocket
    let server: RPCServer

    before(async () => {
        server = new RPCServer([{
            name: "test",
            RPCs: () => [{
                name: 'subscribe',
                hook: async (callback): Promise<void> => {
                    cb = <Function>callback
                    return
                }
            },
            {
                name: 'subscribeWithParam',
                hook: async (param, callback): Promise<{ uuid: string }> => {

                    if (param != "OK") {
                        console.log("param was" + param);
                        return {
                            uuid: "no",
                        }
                    }
                    cb2 = <Function>callback
                    return {
                        uuid: "OK",
                    }
                }
            },
            function publish(): string { cb(candy); return candy },
            function unsubscribe(): string { candy = noCandy; cb(candy); cb = () => { }; return candy }
            ]
        }], 
        {
            connectionHandler: (socket) => { },
            closeHandler: (socket) => { },
            errorHandler: (socket, err) => { throw err }
        })
        server.listen(21010)
        client = new RPCSocket(21010, "localhost")
        return await client.connect()
    })

    after(() => {
        client.close()
        server.close()
    })

    it('Subscribe with param', (done) => {
        client['test'].subscribeWithParam("OK", c => { }).then(async (res) => {
            if (res.uuid === candy) {
                done()
            } else
                done(new Error("Results did not match " + res.uuid))
        })
    })

    let run = 0
    const expected = [yesCandy, noCandy, noCandy, noCandy]

    it('Unhook+unsubscribe should stop callbacks', (done) => {

        client['test'].subscribe(function myCallback(c) {
            if (run == 1)
                (myCallback as any).destroy()

            if (c !== expected[run++]) {
                done(new Error(`Wrong candy '${c}' in iteration '${run - 1}'`))
            }
        }).then(async function (res) {
            const r1 = await client['test'].publish()
            const r3 = await client['test'].unsubscribe()
            const r2 = await client['test'].publish()
            const r4 = await client['test'].publish()

            if (r1 === yesCandy && r3 === noCandy && r2 === noCandy && r4 === noCandy)
                done()
            else
                done(new Error("Results did not match: " + [r1, r2, r3, r4]))
        })
    })
})

type topicDTO = { topic: string; }

type SesameTestIfc = {
    test: {
        checkCandy: () => Promise<string>
        subscribe: (callback: Function) => Promise<topicDTO>
        manyParams: <A = string, B = number, C = boolean, D = Object>(a: A, b: B, c: C, d: D) => Promise<[A, B, C, D]>
    }

    other: {
        echo: (x: any) => Promise<any>
    }
}

describe('Sesame should unlock the socket', () => {
    let candy = "OK"
    let client: ConnectedSocket<SesameTestIfc>
    let server: RPCServer<SesameTestIfc>
    let cb: Function = (...args) => { }

    before((done) => {
        server = new RPCServer<SesameTestIfc>([{
            name: "test",
            RPCs: () => [
                {
                    name: 'subscribe',
                    hook: async (callback) => {
                        cb = callback
                        return {
                            topic: 'test'
                        }
                    },
                    onClose: (a) => { }
                },
                async function checkCandy() { cb(candy); cb = () => { }; return candy },
                async function manyParams(a, b, c, d) { return [a, b, c, d] }
            ],
        }, {
            name: 'other',
            RPCs: () => [
                async function echo(x) { return x }
            ]

        }], {
            sesame: (_sesame) => _sesame === 'sesame!'
        })
        server.listen(21004)
        const sock = new RPCSocket<SesameTestIfc>(21004, "localhost")
        sock.connect('sesame!').then(cli => {
            client = cli
            done()
        })
    })

    after(() => {
        client.close()
        server.close()
    })

    it('should work with sesame', (done) => {
        client.test.checkCandy().then(c => done())
    })

    it('should work with multiple params', (done) => {
        client.test['manyParams']('a', 'b', 'c', 'd').then(c => {
            if (c[0] == 'a' && c[1] === 'b' && c[2] === 'c' && c[3] === 'd')
                done()
        })
    })

    it('should not work without sesame', (done) => {
        const sock = new RPCSocket(21004, "localhost")
        sock.connect( /* no sesame */).then(async (cli) => {
            if (!cli.test)
                done()
            else {
                done(new Error("Function supposed to be removed without sesame"))
            }
            cli.close()
            sock.close()
        })
    })

    it('should fail with wrong sesame', (done) => {
        const sock = new RPCSocket(21004, "localhost")
        sock.connect('abasd').then(async (cli) => {
            if (!cli.test)
                done()
            else {
                done(new Error("Function supposed to be removed without sesame"))
            }
            cli.close()
            sock.close()
        })
    })

    it('callback should work with sesame', (done) => {
        client.test.subscribe((c) => {
            if (c === candy) {
                done()
            }
        }).then(d => {
            if (d.topic !== 'test')
                done('unexpected invalid response')

            client.test.checkCandy()
        })
    })
})


describe('Error handling', () => {
    const errtxt = "BAD BAD BAD"

    let createUser = async (user: { a: any, b: any }) => {
        throw new Error(errtxt)
    }

    it("RPC throws on client without handler", (done) => {
        let server = new RPCServer([{
            name: "createUser",
            RPCs: () => [{
                name: 'createUser' as 'createUser',
                call: createUser
            }]
        }])
        server.listen(21004)

        let sock = new RPCSocket(21004, 'localhost')
        sock.connect().then((cli) => {
            cli["createUser"]["createUser"]({
                a: 'a',
                b: 'b'
            })
                .then(r => {
                    if (r != null)
                        done(new Error("UNEXPECTED RESULT " + r))
                })
                .catch((e) => {
                    if (e.message === errtxt)
                        done()
                    else
                        done(e)
                })
                .finally(() => {
                    cli.close()
                    sock.close()
                    server.close()
                })
        })
    })

    it("RPC throws on server with handler", (done) => {
        let server = new RPCServer([{
            name: "createUser",
            RPCs: () => [{
                name: 'createUser' as 'createUser',
                call: createUser
            }]
        }], {
            errorHandler: (socket, e, rpcName, args) => {
                done()
            }
        })
        server.listen(21004)

        let sock = new RPCSocket(21004, 'localhost')
        sock.connect().then((cli) => {
            cli["createUser"]["createUser"]({
                a: 'a',
                b: 'b'
            })
                .then(r => {
                    if (r != null)
                        done("UNEXPECTED RESULT " + r)
                })
                .catch((e) => {
                    done("UNEXPECTED CLIENT ERROR " + e)
                    done(e)
                })
                .finally(() => {
                    cli.close()
                    sock.close()
                    server.close()
                })
        })
    })
})


describe("Errorhandler functionality", () => {
    const errtxt = "BAD BAD BAD"

    let createUser = async (user: { a: any, b: any }) => {
        throw new Error(errtxt)
    }

    it("correct values are passed to the handler", (done) => {
        let server = new RPCServer([{
            name: "createUser",
            RPCs: () => [{
                name: 'createUser' as 'createUser',
                call: createUser
            }]
        }], {
            errorHandler: (socket, e, rpcName, args) => {
                if (e.message === errtxt && rpcName === "createUser" && args[0]['a'] === 'a' && args[0]['b'] === 'b')
                    done()
            }
        })
        server.listen(21004)

        let sock = new RPCSocket(21004, 'localhost')
        sock.connect().then((cli) => {
            cli["createUser"]["createUser"]({
                a: 'a',
                b: 'b'
            })
                .then(r => {
                    if (r != null)
                        done("UNEXPECTED RESULT " + r)
                })
                .catch((e) => {
                    done(new Error("UNEXPECTED CLIENT ERROR " + e.message))
                })
                .finally(() => {
                    cli.close()
                    sock.close()
                    server.close()
                })
        })
    })

    it("handler sees sesame", (done) => {
        let sesame = "AAAAAAAAAAAAAAA"
        let server = new RPCServer([{
            name: "createUser" as "createUser",
            RPCs: () => [{
                name: 'createUser' as 'createUser',
                call: createUser
            }]
        }], {
            sesame: sesame,
            errorHandler: (socket, e, rpcName, args) => {
                if (e.message === errtxt && rpcName === "createUser" && args[0] === sesame && args[1]['a'] === 'a' && args[1]['b'] === 'b')
                    done()
            }

        })
        server.listen(21004)

        let sock = new RPCSocket(21004, 'localhost')
        sock.connect(sesame).then((cli) => {
            cli["createUser"]["createUser"]({
                a: 'a',
                b: 'b'
            })
                .then(r => {
                    if (r != null)
                        done("UNEXPECTED RESULT " + r)
                })
                .catch((e) => {
                    done("UNEXPECTED CLIENT ERROR " + e)
                    done(e)
                })
                .finally(() => {
                    cli.close()
                    sock.close()
                    server.close()
                })
        })
    })
})

type myExporterIfc = {
    MyExporter: {
        myRPC: () => Promise<string>
    }
}


describe("Class binding", () => {

    let exporter1: MyExporter
    let serv: RPCServer<myExporterIfc>
    let sock: RPCSocket & myExporterIfc
    let allowed = true

    class MyExporter implements RPCExporter<myExporterIfc>{
        name = "MyExporter" as "MyExporter"
        RPCs = () => [
            this.myRPC
        ]

        myRPC = async () => {
            //serv.setExporters([new MyOtherExporter])
            return "Hello World"
        }
    }

    class MyOtherExporter implements RPCExporter<myExporterIfc>{
        name = "MyExporter" as "MyExporter"
        RPCs = () => [
            this.myRPC
        ]

        myRPC = async () => {
            return "Hello Borld"
        }

    }

    before(done => {
        exporter1 = new MyExporter()
        serv = new RPCServer<myExporterIfc>(
            [exporter1], 
            {
                accessFilter: async (sesame, exporter) => {
                    if (exporter.name === 'MyExporter') {
                        if (!allowed) return false
                        allowed = false
                        return sesame === 'xxx';
                    } else {
                        return false
                    }
                },
                sesame: "xxx"
            })
        serv.listen(21004)
        done()
    })

    beforeEach((done) => {
        const s = new RPCSocket<myExporterIfc>(21004, 'localhost')
        s.connect("xxx").then(conn => {
            sock = conn
            done()
        })
    })

    afterEach((done) => {
        sock.close()
        done()
    })

    after(() => {
        serv.close()
    })

    /* The server-side socket will enter a 30s timeout if destroyed by a RPC.
       to mitigate the impact on testing time these are not run.

    it("binds correctly", function(done){
        this.timeout(1000)
        sock['MyExporter'].myRPC().then((res) => {
            done(new Error(res))
        }).catch(e => {
            //job will time out because of setExporters
            allowed = true
            done()
        })
    })

    it("changes exporters", (done) => {
        
        sock['MyExporter'].myRPC().then((res) => {
            if (res === "Hello Borld")
                done()
            else
                done(new Error(res))
        })
    })
    */


    it("use sesameFilter for available", (done) => {
        if (sock['MyExporter']) {
            allowed = false
            done()
        }
        else done(new Error("RPC supposed to be here"))
    })

    it("use sesameFilter", (done) => {
        if (!sock['MyExporter']) done()
        else done(new Error("RPC supposed to be gone"))
    })
})


describe("attaching handlers before connecting", () => {
    it("fires error if server is unreachable", (done) => {
        const sock = new RPCSocket<myExporterIfc>(21004, 'localhost')
        let errorHandleCount = 0

        sock.on('error', (err) => {
            //attached listener fires first
            if (errorHandleCount != 0) {
                console.log("Error handler didn't fire first");
            } else {
                errorHandleCount++
            }
        })

        sock.connect().then(_ => {
            console.log("Unexpected successful connect")
        }).catch(e => {
            //catch clause fires second
            if (errorHandleCount != 1) {
                console.log("catch clause didn't fire second", errorHandleCount);
            } else {
                sock.close()
                done()
            }
        })
    })

    /*
     * ## 1.11.0 breaking ##
     * 
     * API change: Move from bsock to socketio changes underlying API for when errors are thrown.
     * socketio does not throw on unknown listener. This behaviour is considered more consistent with the design 
     * goals of RPClibrary and was thus adopted 
     *
          
     
    it("fires error if call is unknown", (done) => {
        const serv = new RPCServer(21004)
        const sock = new RPCSocket(21004, 'localhost')

        sock.on('error', (err) => {
            sock.close()
            serv.close()
            done()
        })

        sock.connect().then(_ => {
            sock.call("unknownRPC123", "AAAAA").catch(e => {  }).then(x => {
                console.log("X",x);
                
            })
        }).catch(e => {
            console.log("unexpected connect catch clause");
            done(e)
        })
    })

    it("demands catch on method invocation if call is unknown", (done) => {
        const serv = new RPCServer(21004)
        const sock = new RPCSocket(21004, 'localhost')

        sock.connect().then(_ => {
            sock.call("unknownRPC123", "AAAAA").catch(e => {
                sock.close()
                serv.close()
                done()
            })
        }).catch(e => {
            console.log("unexpected connect catch clause");
            done(e)
        })
    })
    */

})

describe('finally', () => {
    it('print open handles (Ignore `DNSCHANNEL` and `Immediate`)', () => {
        //log(console)
    })
})